Abstract
Thermomechanical analysis (TMA) was used to study the aging of rapidly quenched Fe 85− x Co x B 15 glasses. The three-point flexure technique was principally suitable for this study. The stress relaxation measurements permitted a characterization of the structural relaxation for various compositions. A theoretical approach of the aging of this type of glass was built up within the framework of the non-linear relaxation distribution (DNLR) model based on irreversible thermodynamics. For several isothermal experiments, the reduced property determined from the sample deflection was calculated. Then, the three characteristic parameters of the DNLR model were deduced: the activation enthalpy, the activation entropy, and a parameter of non-linearity. As samples in a relatively wide concentration range were used, the effect of alloying on the model parameters was examined.
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